A data-driven roadmap for creep-fatigue reliability assessment and its implementation in low-pressure turbine disk at elevated temperatures

Acceleration mechanism of the degradation of the lifetime of Ni‐based superalloys under creep‐fatigue loading at elevated temperatures

“…However, when one of the fatigue or creep damage occupied most of the loading, the result was close to the straight line estimated by using conventional theory based on the linear damage rule. Recently, Wang et al have made a number of original breakthroughs in the field of creep‐fatigue from material‐level to component‐level applications 18–24 . In the material‐level, a strain energy density exhaustion (SEDE) model was developed to achieve excellent creep‐fatigue life prediction 18 .…”

“…In the component‐level, a multi‐axial creep‐fatigue life model based on SEDE was built to push into structural applications under the common multi‐axial stress state 23 . More recently, a data‐driven creep‐fatigue reliability assessment, which was integrated with surrogate modeling, was implemented with low‐pressure turbine disk at elevated temperatures 24 . These works provide the scientific basis for the future of reliable operations and maintenance incorporating the digital twin.…”

“…Recently, Wang et al have made a number of original breakthroughs in the field of creep-fatigue from materiallevel to component-level applications. [18][19][20][21][22][23][24] In the material-level, a strain energy density exhaustion (SEDE) model was developed to achieve excellent creep-fatigue life prediction. 18 Afterwards, a time-dependent creepfatigue damage interaction diagram was established for taking full account of the effects of complex loading histories, material property degradation, and other aspects.…”

“…23 More recently, a data-driven creep-fatigue reliability assessment, which was integrated with surrogate modeling, was implemented with low-pressure turbine disk at elevated temperatures. 24 These works provide the scientific basis for the future of reliable operations and maintenance incorporating the digital twin. Based on these progresses, it is of great significance to quantitatively evaluate the meso-scale damage of heat-resistant materials and its lifetime under creep-fatigue loading at elevated temperatures to clarify the clear mechanism of the random creep-fatigue damage and establish an effective and quantitative criterion.…”

Creep behavior and life prediction of a reactor pressure vessel steel above phase‐transformation temperature via a deformation mechanism‐based creep model

“…In the latter category, the models are proposed on the basis of microstructural characteristics, damage mechanisms, deformation mechanisms, and so on. 16,17 A mechanistic creep model was developed for Grade 91 steel based on the fundamental dislocation climbing mechanism, depicting the SSCR as a function of stress, temperature and microstructure. 18 The ductility exhaustion-based damage criteria combined with finite element analyses were utilized to address the multiaxial creep-rupture time of P92 steel.…”